How much power can a 8.75 rearend handle? - Moparts Forums

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Re: How much power can a 8.75 rearend handle? [Re: Crock] #1094460 10/23/11 01:53 AM 10/23/11 01:53 AM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	Going on 8+ years all in the 10`s at 3200lbs. and I run the 742 case w/Richmond 4.11 gears, Dutchman 30 spline axles, stock caps and a backbrace. 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: How much power can a 8.75 rearend handle? [Re: Thumperdart] #1094461 10/23/11 09:15 AM 10/23/11 09:15 AM
Joined: Jul 2009 Posts: 694 Michigan S Super Scamp mopar
Super Scamp mopar S Joined: Jul 2009 Posts: 694 Michigan	Quote: Going on 8+ years all in the 10`s at 3200lbs. and I run the 742 case w/Richmond 4.11 gears, Dutchman 30 spline axles, stock caps and a backbrace. LUCKY...Is correct word in this post. The time is going to come when all of you 10 second cars hook up 1 good time and the weak link is going to cause you to spend lots of to fix you Trans/rear/and maybe the motor. You all need one of these... 6884409-P1200101.JPG (258 downloads) Just One Man's Opinion Mopar Mafia Racing

Re: How much power can a 8.75 rearend handle? [Re: robnbird] #1094462 10/23/11 10:33 AM 10/23/11 10:33 AM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: If I have to ask about a 8 3/4 Im not going to be very confident. better off with a 60 or a 9" ford in my oppenion. OMG you said 9" ford on a Mopar site!!

Re: How much power can a 8.75 rearend handle? [Re: Super Scamp] #1094463 10/23/11 11:32 AM 10/23/11 11:32 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Quote: Going on 8+ years all in the 10`s at 3200lbs. and I run the 742 case w/Richmond 4.11 gears, Dutchman 30 spline axles, stock caps and a backbrace. LUCKY...Is correct word in this post. The time is going to come when all of you 10 second cars hook up 1 good time and the weak link is going to cause you to spend lots of to fix you Trans/rear/and maybe the motor. You all need one of these... I've been in the 8s with my 8 3/4... like I've said a thousand times "I think its a weight issue"... JMO

Re: How much power can a 8.75 rearend handle? [Re: MR_P_BODY] #1094464 10/23/11 12:01 PM 10/23/11 12:01 PM
Joined: Oct 2003 Posts: 11,684 W. Kentucky justinp61 I Live Here
justinp61 I Live Here Joined: Oct 2003 Posts: 11,684 W. Kentucky	I'd say the OP is fine with what he has, if it breaks it will be the teeth on the ring gear. If he was hittin' it hard with a loose converter on a big tire then he'd need a Dana. Just out of curosity to all the guys that claim the 741 is the weakest. How many pinion gears have you seen broken, not teeth but the actual shaft? All 8 3/4s are the same size (in their respective spline count) on the pinion where it is machined for the splines. I've never seen one break there, 741, 742 or a 489. Not saying it has never or won't happen, but all I've seen have broke the teeth on the ring gear for one reason or another.

Re: How much power can a 8.75 rearend handle? [Re: Super Scamp] #1094465 10/23/11 12:08 PM 10/23/11 12:08 PM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	Quote: Quote: Going on 8+ years all in the 10`s at 3200lbs. and I run the 742 case w/Richmond 4.11 gears, Dutchman 30 spline axles, stock caps and a backbrace. LUCKY...Is correct word in this post. The time is going to come when all of you 10 second cars hook up 1 good time and the weak link is going to cause you to spend lots of to fix you Trans/rear/and maybe the motor. You all need one of these... Guess I`m lucky I dont hook up good then even though I see 6"`s of air under the ft. tires. 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: How much power can a 8.75 rearend handle? [Re: Thumperdart] #1094466 10/23/11 12:59 PM 10/23/11 12:59 PM
Joined: Nov 2007 Posts: 1,600 Alberta Canada StrokerAspen top fuel
StrokerAspen top fuel Joined: Nov 2007 Posts: 1,600 Alberta Canada	I ran a string of 10.70's on my 8 3/4 this year. Stock axles, stock caps stock gears and a stock cone sure grip. The car is 3400 race weight with exhaust on. HOWEVER I have a big squishy converter, and I think the 3.23 gears are saving the axles. Best 60' was a 1.55 buy most were 1.59-1.61. I plan on changing to a Dana 60 this winter. Here is a video of a 1.61 leave. It doesn't look like this set up will break anytime soon, but it's a boring launch. http://www.youtube.com/watch?v=8-PO1bCE3E0&feature=youtube_gdata_player -Kenny

Re: How much power can a 8.75 rearend handle? [Re: Thumperdart] #1094467 10/23/11 06:47 PM 10/23/11 06:47 PM
Joined: Oct 2004 Posts: 16,477 Canada CrAzYMoPaRGuY I Live Here
CrAzYMoPaRGuY I Live Here Joined: Oct 2004 Posts: 16,477 Canada	Quote: Quote: Quote: Going on 8+ years all in the 10`s at 3200lbs. and I run the 742 case w/Richmond 4.11 gears, Dutchman 30 spline axles, stock caps and a backbrace. LUCKY...Is correct word in this post. The time is going to come when all of you 10 second cars hook up 1 good time and the weak link is going to cause you to spend lots of to fix you Trans/rear/and maybe the motor. You all need one of these... Guess I`m lucky I dont hook up good then even though I see 6"`s of air under the ft. tires. I was thinking the EXACT same thing when I read his post! CrAzYMoPaRGuY

Re: How much power can a 8.75 rearend handle? [Re: Challenger 1] #1094468 10/23/11 06:52 PM 10/23/11 06:52 PM
Joined: Oct 2004 Posts: 16,477 Canada CrAzYMoPaRGuY I Live Here
CrAzYMoPaRGuY I Live Here Joined: Oct 2004 Posts: 16,477 Canada	Quote: Quote: If I have to ask about a 8 3/4 Im not going to be very confident. better off with a 60 or a 9" ford in my oppenion. OMG you said 9" ford on a Mopar site!! Binder Dundat. Pooched 6 different pumpkins with different brands of brand new gears, spool, 31 spline 4 spider posis, WAR cases, nodular cases, you name it. Jamie Roth, Ian Wood, the crazy AMC guy in Mission, everybody tried to build me a third member, none lasted! No more 9" rears for THIS guy!!!! 6885081-cars.jpg (160 downloads) CrAzYMoPaRGuY

Re: How much power can a 8.75 rearend handle? [Re: CrAzYMoPaRGuY] #1094469 10/24/11 04:23 AM 10/24/11 04:23 AM
Joined: Aug 2006 Posts: 2,141 junction city oregon V viperblue72 top fuel
viperblue72 top fuel V Joined: Aug 2006 Posts: 2,141 junction city oregon	The 8 3/4 is a strong rearend. Set up correctly I think it will work fine for you. Id get some aftermarket axles however. With only a 2400-2800 stall you won't be pushing your luck imo.

Re: How much power can a 8.75 rearend handle? [Re: viperblue72] #1094470 10/24/11 12:07 PM 10/24/11 12:07 PM
Joined: Jan 2003 Posts: 5,762 Hot Rod Ridge FastmOp master
FastmOp master Joined: Jan 2003 Posts: 5,762 Hot Rod Ridge	In may I was down to eight cars and the chick I was racing went red. I had a 5.99 dial in on it when the 8&3/4 let go. It broke the trans too. So I stuck a Dana in it, now I can tranzbreaking it every pass and not worry

Re: How much power can a 8.75 rearend handle? [Re: FastmOp] #1094471 10/24/11 12:56 PM 10/24/11 12:56 PM
Joined: Dec 2009 Posts: 20,622 in a cattle trailer down by th... G Guitar Jones Paddle faster! I hear banjo music!
Guitar Jones Paddle faster! I hear banjo music! G Joined: Dec 2009 Posts: 20,622 in a cattle trailer down by th...	Quote: In may I was down to eight cars and the chick I was racing went red. I had a 5.99 dial in on it when the 8&3/4 let go. It broke the trans too. So I stuck a Dana in it, now I can tranzbreaking it every pass and not worry The last street gear I had broke the teeth on the ring gear on the final points night with 4 rounds to go. I needed one more round to win the track championship. That thing made it through 4 more passes and not only did I win the championship but I won the race too. When I pulled it apart the next day I was amazed it lasted the rest of the night. It looked like it shouldn't have made it onto the trailer. "Follow me the wise man said, but he walked behind" '92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.

Re: How much power can a 8.75 rearend handle? [Re: Guitar Jones] #1094472 10/24/11 02:13 PM 10/24/11 02:13 PM
Joined: Jan 2003 Posts: 5,762 Hot Rod Ridge FastmOp master
FastmOp master Joined: Jan 2003 Posts: 5,762 Hot Rod Ridge	Mine made the tranny make bad noises in any gear and was trying to lock up as I was pull'd off the track. As I was pulling it up to the trailer it lock'd solid and I had to load it with the floor jack and winch. Good Times! I do think the OP is fine and should be ok, but it has a small chance of breaking every time it launch's hard.

Re: How much power can a 8.75 rearend handle? [Re: hemidup] #1094473 10/25/11 03:23 AM 10/25/11 03:23 AM
Joined: Nov 2008 Posts: 833 MN hemidup super stock
hemidup super stock Joined: Nov 2008 Posts: 833 MN	Quote: Just spit one out at the track today. It made it a whole whopping 3'. Hopefully the trans is still good, but doubt it. Quoting myself here.... Lost 18 teeth off the ring gear. Output shaft married itself to the aluminum planitary and of course the sprag was toast. Luckily it didn't split the case. Jerry Williams.

Re: How much power can a 8.75 rearend handle? [Re: Challenger 1] #1094474 10/25/11 07:45 AM 10/25/11 07:45 AM
Joined: Jan 2003 Posts: 1,855 Staten Island N.Y. Dap top fuel
Dap top fuel Joined: Jan 2003 Posts: 1,855 Staten Island N.Y.	Quote: OMG you said 9" ford on a Mopar site!! I think it is ok to say Ford here. They are one of the site sponsors.. PRH446 10.084 @ 135.21 mph N/A through chambered mufflers,3300lbs. Stock stroke wedge

Re: How much power can a 8.75 rearend handle? [Re: Dap] #1094475 10/25/11 11:07 AM 10/25/11 11:07 AM
Joined: Jan 2003 Posts: 3,104 Wheels up, MO N nhramark master
nhramark master N Joined: Jan 2003 Posts: 3,104 Wheels up, MO	I think if you sit down with a piece of paper and cost out making the 8 3/4 stronger vs installing a Dana, you will have your answer. Either way get some good axles in that thing. BTW congrats on your promotion! [image]http://s1126.photobucket.com/user/nhramark1/library/Racing[/image] 9.100 @ 150 mph 5.780 @ 120 mph

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